relationship between jboss cache service and cache loaders

sarojk Apr 24, 2006 8:03 AM

Hello Everybody,

I am using jboss tree cache service in my current project.
I am having lot of doubts while trapping the behavior of treecache and the cacheloaders (i.e. configured into xml as CacheLoaderClass attribute)
Some of my doubts/questions are as follow:

1 ) When do the function - public void put(List modifications) of cache loader is called by cache service?

2) What is the significance/role of Modification object in this context? What does Modification:getType() indicate?

3) When does get(fqn,Object) of loader is called by cache service?

Please reply to the above questions or send me a link to a relevant doc for this. I have been refering to the following link for jboss caching:

http://docs.jboss.com/jbcache/1.2.4/TreeCache/html/#ftn.d0e226#ftn.d0e226

Looking forward your reply.

Thanks and regards

Saroj

1. Re: relationship between jboss cache service and cache loade

manik Apr 24, 2006 8:42 AM (in response to sarojk)

Which version of JBossCache do you use? I'd suggest referring to the docs on http://labs.jboss.org/portal/jbosscache/docs/index.html
Actions
2. Re: relationship between jboss cache service and cache loade

sarojk Apr 26, 2006 6:51 AM (in response to sarojk)

Thanks for your reply. I am using Jboss 4.0.2. I learned that put(List modifications) of CacheLoader(my configured cache loader) is being called while using Transation.
Can you give some information about Modification object, specially what modification.getType() does? I saw JDBCCacheLoader implementation, which is using switch case 1 to case 6. What do these case indicate?

Looking forward for your reply
Thanks and regards
Saroj
Actions

3. Re: relationship between jboss cache service and cache loade

manik Apr 26, 2006 7:23 AM (in response to sarojk)

See the src for Modification.java

http://fisheye.jboss.org/viewrep/~raw,r=1.4/JBoss/JBossCache/src/org/jboss/cache/Modification.java

 /**
 * Put key/value modification.
 */
 public static final byte PUT_KEY_VALUE=1;

 /**
 * Put data (Map) modification.
 */
 public static final byte PUT_DATA=2;

 /**
 * Erase existing data, put data (Map) modification.
 */
 public static final byte PUT_DATA_ERASE=3;

 /**
 * Remove a node modification.
 */
 public static final byte REMOVE_NODE=4;

 /**
 * Remove a key/value modification.
 */
 public static final byte REMOVE_KEY_VALUE=5;

 /**
 * Clear node's Map modification.
 */
 public static final byte REMOVE_DATA=6;

 /**
 * Stores data in a Fqn using a byte array.
 */
 public static final byte STORE_STATE=7;

Go to original post